From: Alexei_Roudnev (Alexei_Roudnev_at_exigengroup.com)
Date: Tue Nov 07 2006 - 23:18:27 CET
Message-ID: <06d201c702ba$a5b1bd10$6f31a8c0@sjc.exigengroup.com> From: "Alexei_Roudnev" <Alexei_Roudnev@exigengroup.com> Date: Tue, 7 Nov 2006 14:18:27 -0800 Subject: Re: [suse-sles-e] qla2xxx problem
It's very strange. Even if I uuse single-image mode on NetApp (which means
that it proxy LUNls to the partner filer so that
1 path is direct and second works tru proxy), I never saw slow performance.
20 - 100 MB/second is what youc an expect (100 when data are in the cache).
----- Original Message -----
From: "Dmitriy Beloslyudtsev" <beloslyu1@gmail.com>
To: <suse-sles-e@suse.com>
Sent: Tuesday, November 07, 2006 10:47 AM
Subject: [suse-sles-e] qla2xxx problem
> Hi!
>
> On a sles9 sp3 with 2.6.5-7.282-smp kernel (qlogic driver version
> 8.01.02-sles) with Qlogic HBA card model QLA2460
> and ql2xfailover set to 0 connected via FC switch to NetApp FAS270c I can
> see two LUNs with Direct-Access type
> to access the same disk via two filer heads. And using simple hdparm -t
> command I can get a raw estimate of the sequential
> read speed. The first LUN gives about 6MB/sec consistently, the second LUN
> gives numbers from 60MB/sec to 150MB/sec.
> When ql2xfailover is set to 1, I see only one disk with 6MB/sec read
speed.
> I tried different versions of the drivers (8.01.04,
> 8.01.01) and even tried different HBA card (QLA 2340) and got the same
> result. BTW, the hardware is Dell PE1950.
>
> I'm confused with this slow performance and don't quite understand if it
is
> a software problem on linux side or hardware
> problem or any misconfiguration on netapp side. Some other MSWindows
> computers are connected to the same NetApp SAN
> via Emulex HBA cards and they don't have any problems. Can anybody give me
a
> hint what could be wrong?
>
> Thx!
>
> Dmitriy
>
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